Sounds like you are doing all the right things twinsister.
I also had an erratic luteal phase and found that taking an additional 50mg of B6 from ovulation and in addition to my vitamins stretched out my LP.

How are you determining when you O btw? Are you using a program or Fertility friend to assist? Because if not, the other possibility is that you think you are O'ing later than you really are. Just a thought.